I find random errors that are hard to replicate in a consistent fashion the most difficult bugs to track down. A while back, a wordpress site I manage would res

I find random errors that are hard to replicate in a consistent fashion the most difficult bugs to track down. A while back, a wordpress site I manage would respond with cipher text for certain pages randomly. After several moments of frantic efforts to fix this, I noticed the issue was that a plugin was doing caching, gzip compression while wordpress was trying to serve pages on https.